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You know it may very well be below 5ppm as anything below 10 is hard for me to tell the difference in my nitrate test kit. The tank has moss and frogbit floating to help reduce nitrates. My reading was also the day after I skipped a water change cause I went to a wedding. I've missed about three water changes total on these tanks. 50% daily is my normal routine.NO3-5-10ppm....?
Would you consider setting up a RO dripping system such that you may further reducing nitrate to <5ppm? Fries are sensitive to NO3 but not adults, as I tried very hard to educate folks on the Forum here.